COLORADJUSTMENT Structure

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The COLORADJUSTMENT structure defines the color adjustment values used by the Windows StretchBlt and StretchDIBits functions when the StretchBlt mode is HALFTONE.

Syntax

typedef struct  tagCOLORADJUSTMENT {    /* ca */  
    WORD caSize;  
    WORD caFlags;  
    WORD caIlluminantIndex;  
    WORD caRedGamma;  
    WORD caGreenGamma;  
    WORD caBlueGamma;  
    WORD caReferenceBlack;  
    WORD caReferenceWhite;  
    SHORT caContrast;  
    SHORT caBrightness;  
    SHORT caColorfulness;  
    SHORT caRedGreenTint;  
} COLORADJUSTMENT;

Parameters

caSize
Specifies the size of the structure in bytes.

caFlags
Specifies how the output image should be prepared. This member can be set to NULL or any combination of the following values:

  • CA_NEGATIVE Specifies that the negative of the original image should be displayed.

  • CA_LOG_FILTER Specifies that a logarithmic function should be applied to the final density of the output colors. This will increase the color contrast when the luminance is low.

caIlluminantIndex
Specifies the luminance of the light source under which the image object is viewed. This member can be set to one of the following values:

  • ILLUMINANT_EQUAL_ENERGY

  • ILLUMINANT_A

  • ILLUMINANT_B

  • ILLUMINANT_C

  • ILLUMINANT_D50

  • ILLUMINANT_D55

  • ILLUMINANT_D65

  • ILLUMINANT_D75

  • ILLUMINANT_F2

  • ILLUMINANT_TURNGSTEN

  • ILLUMINANT_DAYLIGHT

  • ILLUMINANT_FLUORESCENT

  • ILLUMINANT_NTSC

caRedGamma
Specifies the nth power gamma-correction value for the red primary of the source colors. The value must be in the range from 2,500 to 65,000. A value of 10,000 means no gamma-correction.

caGreenGamma
Specifies the nth power gamma-correction value for the green primary of the source colors. The value must be in the range from 2,500 to 65,000. A value of 10,000 means no gamma-correction.

caBlueGamma
Specifies the nth power gamma-correction value for the blue primary of the source colors. The value must be in the range from 2,500 to 65,000. A value of 10,000 means no gamma-correction.

caReferenceBlack
Specifies the black reference for the source colors. Any colors that are darker than this are treated as black. The value must be in the range from 0 to 4,000.

caReferenceWhite
Specifies the white reference for the source colors. Any colors that are lighter than this are treated as white. The value must be in the range from 6,000 to 10,000.

caContrast
Specifies the amount of contrast to be applied to the source object. The value must be in the range from -100 to 100. A value of 0 means no contrast adjustment.

caBrightness
Specifies the amount of brightness to be applied to the source object. The value must be in the range from -100 to 100. A value of 0 means no brightness adjustment.

caColorfulness
Specifies the amount of colorfulness to be applied to the source object. The value must be in the range from -100 to 100. A value of 0 means no colorfulness adjustment.

caRedGreenTint
Specifies the amount of red or green tint adjustment to be applied to the source object. The value must be in the range from -100 to 100. Positive numbers would adjust towards red and negative numbers adjust towards green. A 0 means no tint adjustment.

Requirements

Header: wingdi.h

See Also

Structures, Styles, Callbacks, and Message Maps
CDC::GetColorAdjustment